Sara Walker is an astrobiologist and theoretical physicist. She is the author of a new book titled “Life as No One Knows It: The Physics of Life’s Emergence”. Please support this podcast by checking out our sponsors:
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Transcript: https://lexfridman.com/sara-walker-3-transcript

EPISODE LINKS:
Sara’s Book – Life as No One Knows It: https://amzn.to/3wVmOe1
Sara’s X: https://x.com/Sara_Imari
Sara’s Instagram: https://instagram.com/alien_matter

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OUTLINE:
Here’s the timestamps for the episode. On some podcast players you should be able to click the timestamp to jump to that time.
(00:00) – Introduction
(10:40) – Definition of life
(31:18) – Time and space
(42:00) – Technosphere
(46:25) – Theory of everything
(55:06) – Origin of life
(1:16:44) – Assembly theory
(1:32:58) – Aliens
(1:44:48) – Great Perceptual Filter
(1:48:45) – Fashion
(1:52:47) – Beauty
(1:59:08) – Language
(2:05:50) – Computation
(2:15:37) – Consciousness
(2:24:28) – Artificial life
(2:48:21) – Free will
(2:55:05) – Why anything exists

September 30, 2025 - Hour 2